4 January 1718 (Can't find Sources - Maybe just not seeing them?)
OR
1 April 1718. (Edited & augmented by GISA Originally compiled by J.A. Heese & R.T.J. Lombard, South African Genealogies 5 L-M, GISA SA Genealogies (Stellenbosch, South Africa: Genealogical Institute of South Africa, 1999), Page 163) cited by the FFYP http://www.e-family.co.za/ffy/g5/p5118.htm
There's been a transposition of the 1 and the 4 - But where the typo occurred is the issue. Possibly easier to do on Geni with the international dating differences, so I'm going with the second, unless someone has contradictory sources that support keeping the first?